Chapter 3 - Equations and Problem Solving - 3.4 - Equations Involving Parentheses and Fractional Forms - Problem Set 3.4 - Page 123: 25

$n=-2$

The distributive property allows us to distribute anything multiplied by something inside of the parenthesis to whatever is inside of the parenthesis. Thus, we distribute the 3 to everything inside of the first set of parenthesis and the -5 to everything inside of the second set of parenthesis, giving us the equation 3n-30-5n-60=-86 We now simplify: $-2n-90=-86 \\\\ -2n=4 \\\\ n=-2$